What are the tire pressure ranges for Nose Landing Gear and Main Landing Gear tires?

• A. Nose 155-165 psi; Main 139-149 psi
• B. Nose 120-140 psi; Main 100-120 psi
• C. Nose 139-149 psi; Main 155-165 psi
• D. Nose 140-160 psi; Main 130-140 psi

Answer: (A)

Tire pressure is chosen to match how each gear carries load and supports handling on the ground. Nose landing gear tires are inflated to a higher range (155–165 psi) to keep them stiff enough for precise steering and to maintain proper geometry when the forward of the aircraft bears less weight. Main landing gear tires are kept at a lower range (139–149 psi) because they support most of the aircraft weight; a bit more tire footprint helps distribute that load, improves shock absorption, and reduces wear.

This combination—nose 155–165 psi and main 139–149 psi—fits the typical C-17 maintenance specifications for safe ground handling and tire life. Other options either swap the ranges or set pressures outside what’s recommended, which would alter the footprint and handling characteristics.